Loading...
1/*
2 * arch/arm/mach-tegra/gpio.c
3 *
4 * Copyright (c) 2010 Google, Inc
5 *
6 * Author:
7 * Erik Gilling <konkers@google.com>
8 *
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 */
19
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/irq.h>
23#include <linux/interrupt.h>
24#include <linux/io.h>
25#include <linux/gpio.h>
26#include <linux/of_device.h>
27#include <linux/platform_device.h>
28#include <linux/module.h>
29#include <linux/irqdomain.h>
30#include <linux/irqchip/chained_irq.h>
31#include <linux/pinctrl/consumer.h>
32#include <linux/pm.h>
33
34#define GPIO_BANK(x) ((x) >> 5)
35#define GPIO_PORT(x) (((x) >> 3) & 0x3)
36#define GPIO_BIT(x) ((x) & 0x7)
37
38#define GPIO_REG(x) (GPIO_BANK(x) * tegra_gpio_bank_stride + \
39 GPIO_PORT(x) * 4)
40
41#define GPIO_CNF(x) (GPIO_REG(x) + 0x00)
42#define GPIO_OE(x) (GPIO_REG(x) + 0x10)
43#define GPIO_OUT(x) (GPIO_REG(x) + 0X20)
44#define GPIO_IN(x) (GPIO_REG(x) + 0x30)
45#define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40)
46#define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50)
47#define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60)
48#define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70)
49
50#define GPIO_MSK_CNF(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x00)
51#define GPIO_MSK_OE(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x10)
52#define GPIO_MSK_OUT(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0X20)
53#define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x40)
54#define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x50)
55#define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x60)
56
57#define GPIO_INT_LVL_MASK 0x010101
58#define GPIO_INT_LVL_EDGE_RISING 0x000101
59#define GPIO_INT_LVL_EDGE_FALLING 0x000100
60#define GPIO_INT_LVL_EDGE_BOTH 0x010100
61#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
62#define GPIO_INT_LVL_LEVEL_LOW 0x000000
63
64struct tegra_gpio_bank {
65 int bank;
66 int irq;
67 spinlock_t lvl_lock[4];
68#ifdef CONFIG_PM_SLEEP
69 u32 cnf[4];
70 u32 out[4];
71 u32 oe[4];
72 u32 int_enb[4];
73 u32 int_lvl[4];
74 u32 wake_enb[4];
75#endif
76};
77
78static struct device *dev;
79static struct irq_domain *irq_domain;
80static void __iomem *regs;
81static u32 tegra_gpio_bank_count;
82static u32 tegra_gpio_bank_stride;
83static u32 tegra_gpio_upper_offset;
84static struct tegra_gpio_bank *tegra_gpio_banks;
85
86static inline void tegra_gpio_writel(u32 val, u32 reg)
87{
88 __raw_writel(val, regs + reg);
89}
90
91static inline u32 tegra_gpio_readl(u32 reg)
92{
93 return __raw_readl(regs + reg);
94}
95
96static int tegra_gpio_compose(int bank, int port, int bit)
97{
98 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
99}
100
101static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
102{
103 u32 val;
104
105 val = 0x100 << GPIO_BIT(gpio);
106 if (value)
107 val |= 1 << GPIO_BIT(gpio);
108 tegra_gpio_writel(val, reg);
109}
110
111static void tegra_gpio_enable(int gpio)
112{
113 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
114}
115
116static void tegra_gpio_disable(int gpio)
117{
118 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
119}
120
121static int tegra_gpio_request(struct gpio_chip *chip, unsigned offset)
122{
123 return pinctrl_request_gpio(offset);
124}
125
126static void tegra_gpio_free(struct gpio_chip *chip, unsigned offset)
127{
128 pinctrl_free_gpio(offset);
129 tegra_gpio_disable(offset);
130}
131
132static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
133{
134 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
135}
136
137static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
138{
139 /* If gpio is in output mode then read from the out value */
140 if ((tegra_gpio_readl(GPIO_OE(offset)) >> GPIO_BIT(offset)) & 1)
141 return (tegra_gpio_readl(GPIO_OUT(offset)) >>
142 GPIO_BIT(offset)) & 0x1;
143
144 return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
145}
146
147static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
148{
149 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
150 tegra_gpio_enable(offset);
151 return 0;
152}
153
154static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
155 int value)
156{
157 tegra_gpio_set(chip, offset, value);
158 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
159 tegra_gpio_enable(offset);
160 return 0;
161}
162
163static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
164{
165 return irq_find_mapping(irq_domain, offset);
166}
167
168static struct gpio_chip tegra_gpio_chip = {
169 .label = "tegra-gpio",
170 .request = tegra_gpio_request,
171 .free = tegra_gpio_free,
172 .direction_input = tegra_gpio_direction_input,
173 .get = tegra_gpio_get,
174 .direction_output = tegra_gpio_direction_output,
175 .set = tegra_gpio_set,
176 .to_irq = tegra_gpio_to_irq,
177 .base = 0,
178};
179
180static void tegra_gpio_irq_ack(struct irq_data *d)
181{
182 int gpio = d->hwirq;
183
184 tegra_gpio_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
185}
186
187static void tegra_gpio_irq_mask(struct irq_data *d)
188{
189 int gpio = d->hwirq;
190
191 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
192}
193
194static void tegra_gpio_irq_unmask(struct irq_data *d)
195{
196 int gpio = d->hwirq;
197
198 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
199}
200
201static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
202{
203 int gpio = d->hwirq;
204 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
205 int port = GPIO_PORT(gpio);
206 int lvl_type;
207 int val;
208 unsigned long flags;
209 int ret;
210
211 switch (type & IRQ_TYPE_SENSE_MASK) {
212 case IRQ_TYPE_EDGE_RISING:
213 lvl_type = GPIO_INT_LVL_EDGE_RISING;
214 break;
215
216 case IRQ_TYPE_EDGE_FALLING:
217 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
218 break;
219
220 case IRQ_TYPE_EDGE_BOTH:
221 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
222 break;
223
224 case IRQ_TYPE_LEVEL_HIGH:
225 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
226 break;
227
228 case IRQ_TYPE_LEVEL_LOW:
229 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
230 break;
231
232 default:
233 return -EINVAL;
234 }
235
236 ret = gpiochip_lock_as_irq(&tegra_gpio_chip, gpio);
237 if (ret) {
238 dev_err(dev, "unable to lock Tegra GPIO %d as IRQ\n", gpio);
239 return ret;
240 }
241
242 spin_lock_irqsave(&bank->lvl_lock[port], flags);
243
244 val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
245 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
246 val |= lvl_type << GPIO_BIT(gpio);
247 tegra_gpio_writel(val, GPIO_INT_LVL(gpio));
248
249 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
250
251 tegra_gpio_mask_write(GPIO_MSK_OE(gpio), gpio, 0);
252 tegra_gpio_enable(gpio);
253
254 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
255 irq_set_handler_locked(d, handle_level_irq);
256 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
257 irq_set_handler_locked(d, handle_edge_irq);
258
259 return 0;
260}
261
262static void tegra_gpio_irq_shutdown(struct irq_data *d)
263{
264 int gpio = d->hwirq;
265
266 gpiochip_unlock_as_irq(&tegra_gpio_chip, gpio);
267}
268
269static void tegra_gpio_irq_handler(struct irq_desc *desc)
270{
271 int port;
272 int pin;
273 int unmasked = 0;
274 struct irq_chip *chip = irq_desc_get_chip(desc);
275 struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc);
276
277 chained_irq_enter(chip, desc);
278
279 for (port = 0; port < 4; port++) {
280 int gpio = tegra_gpio_compose(bank->bank, port, 0);
281 unsigned long sta = tegra_gpio_readl(GPIO_INT_STA(gpio)) &
282 tegra_gpio_readl(GPIO_INT_ENB(gpio));
283 u32 lvl = tegra_gpio_readl(GPIO_INT_LVL(gpio));
284
285 for_each_set_bit(pin, &sta, 8) {
286 tegra_gpio_writel(1 << pin, GPIO_INT_CLR(gpio));
287
288 /* if gpio is edge triggered, clear condition
289 * before executing the handler so that we don't
290 * miss edges
291 */
292 if (lvl & (0x100 << pin)) {
293 unmasked = 1;
294 chained_irq_exit(chip, desc);
295 }
296
297 generic_handle_irq(gpio_to_irq(gpio + pin));
298 }
299 }
300
301 if (!unmasked)
302 chained_irq_exit(chip, desc);
303
304}
305
306#ifdef CONFIG_PM_SLEEP
307static int tegra_gpio_resume(struct device *dev)
308{
309 unsigned long flags;
310 int b;
311 int p;
312
313 local_irq_save(flags);
314
315 for (b = 0; b < tegra_gpio_bank_count; b++) {
316 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
317
318 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
319 unsigned int gpio = (b<<5) | (p<<3);
320 tegra_gpio_writel(bank->cnf[p], GPIO_CNF(gpio));
321 tegra_gpio_writel(bank->out[p], GPIO_OUT(gpio));
322 tegra_gpio_writel(bank->oe[p], GPIO_OE(gpio));
323 tegra_gpio_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
324 tegra_gpio_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
325 }
326 }
327
328 local_irq_restore(flags);
329 return 0;
330}
331
332static int tegra_gpio_suspend(struct device *dev)
333{
334 unsigned long flags;
335 int b;
336 int p;
337
338 local_irq_save(flags);
339 for (b = 0; b < tegra_gpio_bank_count; b++) {
340 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
341
342 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
343 unsigned int gpio = (b<<5) | (p<<3);
344 bank->cnf[p] = tegra_gpio_readl(GPIO_CNF(gpio));
345 bank->out[p] = tegra_gpio_readl(GPIO_OUT(gpio));
346 bank->oe[p] = tegra_gpio_readl(GPIO_OE(gpio));
347 bank->int_enb[p] = tegra_gpio_readl(GPIO_INT_ENB(gpio));
348 bank->int_lvl[p] = tegra_gpio_readl(GPIO_INT_LVL(gpio));
349
350 /* Enable gpio irq for wake up source */
351 tegra_gpio_writel(bank->wake_enb[p],
352 GPIO_INT_ENB(gpio));
353 }
354 }
355 local_irq_restore(flags);
356 return 0;
357}
358
359static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
360{
361 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
362 int gpio = d->hwirq;
363 u32 port, bit, mask;
364
365 port = GPIO_PORT(gpio);
366 bit = GPIO_BIT(gpio);
367 mask = BIT(bit);
368
369 if (enable)
370 bank->wake_enb[port] |= mask;
371 else
372 bank->wake_enb[port] &= ~mask;
373
374 return irq_set_irq_wake(bank->irq, enable);
375}
376#endif
377
378#ifdef CONFIG_DEBUG_FS
379
380#include <linux/debugfs.h>
381#include <linux/seq_file.h>
382
383static int dbg_gpio_show(struct seq_file *s, void *unused)
384{
385 int i;
386 int j;
387
388 for (i = 0; i < tegra_gpio_bank_count; i++) {
389 for (j = 0; j < 4; j++) {
390 int gpio = tegra_gpio_compose(i, j, 0);
391 seq_printf(s,
392 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
393 i, j,
394 tegra_gpio_readl(GPIO_CNF(gpio)),
395 tegra_gpio_readl(GPIO_OE(gpio)),
396 tegra_gpio_readl(GPIO_OUT(gpio)),
397 tegra_gpio_readl(GPIO_IN(gpio)),
398 tegra_gpio_readl(GPIO_INT_STA(gpio)),
399 tegra_gpio_readl(GPIO_INT_ENB(gpio)),
400 tegra_gpio_readl(GPIO_INT_LVL(gpio)));
401 }
402 }
403 return 0;
404}
405
406static int dbg_gpio_open(struct inode *inode, struct file *file)
407{
408 return single_open(file, dbg_gpio_show, &inode->i_private);
409}
410
411static const struct file_operations debug_fops = {
412 .open = dbg_gpio_open,
413 .read = seq_read,
414 .llseek = seq_lseek,
415 .release = single_release,
416};
417
418static void tegra_gpio_debuginit(void)
419{
420 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
421 NULL, NULL, &debug_fops);
422}
423
424#else
425
426static inline void tegra_gpio_debuginit(void)
427{
428}
429
430#endif
431
432static struct irq_chip tegra_gpio_irq_chip = {
433 .name = "GPIO",
434 .irq_ack = tegra_gpio_irq_ack,
435 .irq_mask = tegra_gpio_irq_mask,
436 .irq_unmask = tegra_gpio_irq_unmask,
437 .irq_set_type = tegra_gpio_irq_set_type,
438 .irq_shutdown = tegra_gpio_irq_shutdown,
439#ifdef CONFIG_PM_SLEEP
440 .irq_set_wake = tegra_gpio_irq_set_wake,
441#endif
442};
443
444static const struct dev_pm_ops tegra_gpio_pm_ops = {
445 SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
446};
447
448struct tegra_gpio_soc_config {
449 u32 bank_stride;
450 u32 upper_offset;
451};
452
453static struct tegra_gpio_soc_config tegra20_gpio_config = {
454 .bank_stride = 0x80,
455 .upper_offset = 0x800,
456};
457
458static struct tegra_gpio_soc_config tegra30_gpio_config = {
459 .bank_stride = 0x100,
460 .upper_offset = 0x80,
461};
462
463static const struct of_device_id tegra_gpio_of_match[] = {
464 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
465 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
466 { },
467};
468
469/* This lock class tells lockdep that GPIO irqs are in a different
470 * category than their parents, so it won't report false recursion.
471 */
472static struct lock_class_key gpio_lock_class;
473
474static int tegra_gpio_probe(struct platform_device *pdev)
475{
476 const struct of_device_id *match;
477 struct tegra_gpio_soc_config *config;
478 struct resource *res;
479 struct tegra_gpio_bank *bank;
480 int ret;
481 int gpio;
482 int i;
483 int j;
484
485 dev = &pdev->dev;
486
487 match = of_match_device(tegra_gpio_of_match, &pdev->dev);
488 if (!match) {
489 dev_err(&pdev->dev, "Error: No device match found\n");
490 return -ENODEV;
491 }
492 config = (struct tegra_gpio_soc_config *)match->data;
493
494 tegra_gpio_bank_stride = config->bank_stride;
495 tegra_gpio_upper_offset = config->upper_offset;
496
497 for (;;) {
498 res = platform_get_resource(pdev, IORESOURCE_IRQ, tegra_gpio_bank_count);
499 if (!res)
500 break;
501 tegra_gpio_bank_count++;
502 }
503 if (!tegra_gpio_bank_count) {
504 dev_err(&pdev->dev, "Missing IRQ resource\n");
505 return -ENODEV;
506 }
507
508 tegra_gpio_chip.ngpio = tegra_gpio_bank_count * 32;
509
510 tegra_gpio_banks = devm_kzalloc(&pdev->dev,
511 tegra_gpio_bank_count * sizeof(*tegra_gpio_banks),
512 GFP_KERNEL);
513 if (!tegra_gpio_banks)
514 return -ENODEV;
515
516 irq_domain = irq_domain_add_linear(pdev->dev.of_node,
517 tegra_gpio_chip.ngpio,
518 &irq_domain_simple_ops, NULL);
519 if (!irq_domain)
520 return -ENODEV;
521
522 for (i = 0; i < tegra_gpio_bank_count; i++) {
523 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
524 if (!res) {
525 dev_err(&pdev->dev, "Missing IRQ resource\n");
526 return -ENODEV;
527 }
528
529 bank = &tegra_gpio_banks[i];
530 bank->bank = i;
531 bank->irq = res->start;
532 }
533
534 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
535 regs = devm_ioremap_resource(&pdev->dev, res);
536 if (IS_ERR(regs))
537 return PTR_ERR(regs);
538
539 for (i = 0; i < tegra_gpio_bank_count; i++) {
540 for (j = 0; j < 4; j++) {
541 int gpio = tegra_gpio_compose(i, j, 0);
542 tegra_gpio_writel(0x00, GPIO_INT_ENB(gpio));
543 }
544 }
545
546 tegra_gpio_chip.of_node = pdev->dev.of_node;
547
548 ret = devm_gpiochip_add_data(&pdev->dev, &tegra_gpio_chip, NULL);
549 if (ret < 0) {
550 irq_domain_remove(irq_domain);
551 return ret;
552 }
553
554 for (gpio = 0; gpio < tegra_gpio_chip.ngpio; gpio++) {
555 int irq = irq_create_mapping(irq_domain, gpio);
556 /* No validity check; all Tegra GPIOs are valid IRQs */
557
558 bank = &tegra_gpio_banks[GPIO_BANK(gpio)];
559
560 irq_set_lockdep_class(irq, &gpio_lock_class);
561 irq_set_chip_data(irq, bank);
562 irq_set_chip_and_handler(irq, &tegra_gpio_irq_chip,
563 handle_simple_irq);
564 }
565
566 for (i = 0; i < tegra_gpio_bank_count; i++) {
567 bank = &tegra_gpio_banks[i];
568
569 irq_set_chained_handler_and_data(bank->irq,
570 tegra_gpio_irq_handler, bank);
571
572 for (j = 0; j < 4; j++)
573 spin_lock_init(&bank->lvl_lock[j]);
574 }
575
576 tegra_gpio_debuginit();
577
578 return 0;
579}
580
581static struct platform_driver tegra_gpio_driver = {
582 .driver = {
583 .name = "tegra-gpio",
584 .pm = &tegra_gpio_pm_ops,
585 .of_match_table = tegra_gpio_of_match,
586 },
587 .probe = tegra_gpio_probe,
588};
589
590static int __init tegra_gpio_init(void)
591{
592 return platform_driver_register(&tegra_gpio_driver);
593}
594postcore_initcall(tegra_gpio_init);
1/*
2 * arch/arm/mach-tegra/gpio.c
3 *
4 * Copyright (c) 2010 Google, Inc
5 *
6 * Author:
7 * Erik Gilling <konkers@google.com>
8 *
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 */
19
20#include <linux/init.h>
21#include <linux/irq.h>
22#include <linux/interrupt.h>
23
24#include <linux/io.h>
25#include <linux/gpio.h>
26#include <linux/of.h>
27
28#include <asm/mach/irq.h>
29
30#include <mach/iomap.h>
31#include <mach/suspend.h>
32
33#define GPIO_BANK(x) ((x) >> 5)
34#define GPIO_PORT(x) (((x) >> 3) & 0x3)
35#define GPIO_BIT(x) ((x) & 0x7)
36
37#define GPIO_REG(x) (IO_TO_VIRT(TEGRA_GPIO_BASE) + \
38 GPIO_BANK(x) * 0x80 + \
39 GPIO_PORT(x) * 4)
40
41#define GPIO_CNF(x) (GPIO_REG(x) + 0x00)
42#define GPIO_OE(x) (GPIO_REG(x) + 0x10)
43#define GPIO_OUT(x) (GPIO_REG(x) + 0X20)
44#define GPIO_IN(x) (GPIO_REG(x) + 0x30)
45#define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40)
46#define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50)
47#define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60)
48#define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70)
49
50#define GPIO_MSK_CNF(x) (GPIO_REG(x) + 0x800)
51#define GPIO_MSK_OE(x) (GPIO_REG(x) + 0x810)
52#define GPIO_MSK_OUT(x) (GPIO_REG(x) + 0X820)
53#define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + 0x840)
54#define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + 0x850)
55#define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + 0x860)
56
57#define GPIO_INT_LVL_MASK 0x010101
58#define GPIO_INT_LVL_EDGE_RISING 0x000101
59#define GPIO_INT_LVL_EDGE_FALLING 0x000100
60#define GPIO_INT_LVL_EDGE_BOTH 0x010100
61#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
62#define GPIO_INT_LVL_LEVEL_LOW 0x000000
63
64struct tegra_gpio_bank {
65 int bank;
66 int irq;
67 spinlock_t lvl_lock[4];
68#ifdef CONFIG_PM
69 u32 cnf[4];
70 u32 out[4];
71 u32 oe[4];
72 u32 int_enb[4];
73 u32 int_lvl[4];
74#endif
75};
76
77
78static struct tegra_gpio_bank tegra_gpio_banks[] = {
79 {.bank = 0, .irq = INT_GPIO1},
80 {.bank = 1, .irq = INT_GPIO2},
81 {.bank = 2, .irq = INT_GPIO3},
82 {.bank = 3, .irq = INT_GPIO4},
83 {.bank = 4, .irq = INT_GPIO5},
84 {.bank = 5, .irq = INT_GPIO6},
85 {.bank = 6, .irq = INT_GPIO7},
86};
87
88static int tegra_gpio_compose(int bank, int port, int bit)
89{
90 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
91}
92
93static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
94{
95 u32 val;
96
97 val = 0x100 << GPIO_BIT(gpio);
98 if (value)
99 val |= 1 << GPIO_BIT(gpio);
100 __raw_writel(val, reg);
101}
102
103void tegra_gpio_enable(int gpio)
104{
105 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
106}
107
108void tegra_gpio_disable(int gpio)
109{
110 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
111}
112
113static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
114{
115 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
116}
117
118static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
119{
120 return (__raw_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
121}
122
123static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
124{
125 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
126 return 0;
127}
128
129static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
130 int value)
131{
132 tegra_gpio_set(chip, offset, value);
133 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
134 return 0;
135}
136
137
138
139static struct gpio_chip tegra_gpio_chip = {
140 .label = "tegra-gpio",
141 .direction_input = tegra_gpio_direction_input,
142 .get = tegra_gpio_get,
143 .direction_output = tegra_gpio_direction_output,
144 .set = tegra_gpio_set,
145 .base = 0,
146 .ngpio = TEGRA_NR_GPIOS,
147};
148
149static void tegra_gpio_irq_ack(struct irq_data *d)
150{
151 int gpio = d->irq - INT_GPIO_BASE;
152
153 __raw_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
154}
155
156static void tegra_gpio_irq_mask(struct irq_data *d)
157{
158 int gpio = d->irq - INT_GPIO_BASE;
159
160 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
161}
162
163static void tegra_gpio_irq_unmask(struct irq_data *d)
164{
165 int gpio = d->irq - INT_GPIO_BASE;
166
167 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
168}
169
170static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
171{
172 int gpio = d->irq - INT_GPIO_BASE;
173 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
174 int port = GPIO_PORT(gpio);
175 int lvl_type;
176 int val;
177 unsigned long flags;
178
179 switch (type & IRQ_TYPE_SENSE_MASK) {
180 case IRQ_TYPE_EDGE_RISING:
181 lvl_type = GPIO_INT_LVL_EDGE_RISING;
182 break;
183
184 case IRQ_TYPE_EDGE_FALLING:
185 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
186 break;
187
188 case IRQ_TYPE_EDGE_BOTH:
189 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
190 break;
191
192 case IRQ_TYPE_LEVEL_HIGH:
193 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
194 break;
195
196 case IRQ_TYPE_LEVEL_LOW:
197 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
198 break;
199
200 default:
201 return -EINVAL;
202 }
203
204 spin_lock_irqsave(&bank->lvl_lock[port], flags);
205
206 val = __raw_readl(GPIO_INT_LVL(gpio));
207 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
208 val |= lvl_type << GPIO_BIT(gpio);
209 __raw_writel(val, GPIO_INT_LVL(gpio));
210
211 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
212
213 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
214 __irq_set_handler_locked(d->irq, handle_level_irq);
215 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
216 __irq_set_handler_locked(d->irq, handle_edge_irq);
217
218 return 0;
219}
220
221static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
222{
223 struct tegra_gpio_bank *bank;
224 int port;
225 int pin;
226 int unmasked = 0;
227 struct irq_chip *chip = irq_desc_get_chip(desc);
228
229 chained_irq_enter(chip, desc);
230
231 bank = irq_get_handler_data(irq);
232
233 for (port = 0; port < 4; port++) {
234 int gpio = tegra_gpio_compose(bank->bank, port, 0);
235 unsigned long sta = __raw_readl(GPIO_INT_STA(gpio)) &
236 __raw_readl(GPIO_INT_ENB(gpio));
237 u32 lvl = __raw_readl(GPIO_INT_LVL(gpio));
238
239 for_each_set_bit(pin, &sta, 8) {
240 __raw_writel(1 << pin, GPIO_INT_CLR(gpio));
241
242 /* if gpio is edge triggered, clear condition
243 * before executing the hander so that we don't
244 * miss edges
245 */
246 if (lvl & (0x100 << pin)) {
247 unmasked = 1;
248 chained_irq_exit(chip, desc);
249 }
250
251 generic_handle_irq(gpio_to_irq(gpio + pin));
252 }
253 }
254
255 if (!unmasked)
256 chained_irq_exit(chip, desc);
257
258}
259
260#ifdef CONFIG_PM
261void tegra_gpio_resume(void)
262{
263 unsigned long flags;
264 int b;
265 int p;
266
267 local_irq_save(flags);
268
269 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
270 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
271
272 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
273 unsigned int gpio = (b<<5) | (p<<3);
274 __raw_writel(bank->cnf[p], GPIO_CNF(gpio));
275 __raw_writel(bank->out[p], GPIO_OUT(gpio));
276 __raw_writel(bank->oe[p], GPIO_OE(gpio));
277 __raw_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
278 __raw_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
279 }
280 }
281
282 local_irq_restore(flags);
283}
284
285void tegra_gpio_suspend(void)
286{
287 unsigned long flags;
288 int b;
289 int p;
290
291 local_irq_save(flags);
292 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
293 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
294
295 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
296 unsigned int gpio = (b<<5) | (p<<3);
297 bank->cnf[p] = __raw_readl(GPIO_CNF(gpio));
298 bank->out[p] = __raw_readl(GPIO_OUT(gpio));
299 bank->oe[p] = __raw_readl(GPIO_OE(gpio));
300 bank->int_enb[p] = __raw_readl(GPIO_INT_ENB(gpio));
301 bank->int_lvl[p] = __raw_readl(GPIO_INT_LVL(gpio));
302 }
303 }
304 local_irq_restore(flags);
305}
306
307static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
308{
309 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
310 return irq_set_irq_wake(bank->irq, enable);
311}
312#endif
313
314static struct irq_chip tegra_gpio_irq_chip = {
315 .name = "GPIO",
316 .irq_ack = tegra_gpio_irq_ack,
317 .irq_mask = tegra_gpio_irq_mask,
318 .irq_unmask = tegra_gpio_irq_unmask,
319 .irq_set_type = tegra_gpio_irq_set_type,
320#ifdef CONFIG_PM
321 .irq_set_wake = tegra_gpio_wake_enable,
322#endif
323};
324
325
326/* This lock class tells lockdep that GPIO irqs are in a different
327 * category than their parents, so it won't report false recursion.
328 */
329static struct lock_class_key gpio_lock_class;
330
331static int __init tegra_gpio_init(void)
332{
333 struct tegra_gpio_bank *bank;
334 int i;
335 int j;
336
337 for (i = 0; i < 7; i++) {
338 for (j = 0; j < 4; j++) {
339 int gpio = tegra_gpio_compose(i, j, 0);
340 __raw_writel(0x00, GPIO_INT_ENB(gpio));
341 }
342 }
343
344#ifdef CONFIG_OF_GPIO
345 /*
346 * This isn't ideal, but it gets things hooked up until this
347 * driver is converted into a platform_device
348 */
349 tegra_gpio_chip.of_node = of_find_compatible_node(NULL, NULL,
350 "nvidia,tegra20-gpio");
351#endif /* CONFIG_OF_GPIO */
352
353 gpiochip_add(&tegra_gpio_chip);
354
355 for (i = INT_GPIO_BASE; i < (INT_GPIO_BASE + TEGRA_NR_GPIOS); i++) {
356 bank = &tegra_gpio_banks[GPIO_BANK(irq_to_gpio(i))];
357
358 irq_set_lockdep_class(i, &gpio_lock_class);
359 irq_set_chip_data(i, bank);
360 irq_set_chip_and_handler(i, &tegra_gpio_irq_chip,
361 handle_simple_irq);
362 set_irq_flags(i, IRQF_VALID);
363 }
364
365 for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) {
366 bank = &tegra_gpio_banks[i];
367
368 irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler);
369 irq_set_handler_data(bank->irq, bank);
370
371 for (j = 0; j < 4; j++)
372 spin_lock_init(&bank->lvl_lock[j]);
373 }
374
375 return 0;
376}
377
378postcore_initcall(tegra_gpio_init);
379
380void __init tegra_gpio_config(struct tegra_gpio_table *table, int num)
381{
382 int i;
383
384 for (i = 0; i < num; i++) {
385 int gpio = table[i].gpio;
386
387 if (table[i].enable)
388 tegra_gpio_enable(gpio);
389 else
390 tegra_gpio_disable(gpio);
391 }
392}
393
394#ifdef CONFIG_DEBUG_FS
395
396#include <linux/debugfs.h>
397#include <linux/seq_file.h>
398
399static int dbg_gpio_show(struct seq_file *s, void *unused)
400{
401 int i;
402 int j;
403
404 for (i = 0; i < 7; i++) {
405 for (j = 0; j < 4; j++) {
406 int gpio = tegra_gpio_compose(i, j, 0);
407 seq_printf(s,
408 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
409 i, j,
410 __raw_readl(GPIO_CNF(gpio)),
411 __raw_readl(GPIO_OE(gpio)),
412 __raw_readl(GPIO_OUT(gpio)),
413 __raw_readl(GPIO_IN(gpio)),
414 __raw_readl(GPIO_INT_STA(gpio)),
415 __raw_readl(GPIO_INT_ENB(gpio)),
416 __raw_readl(GPIO_INT_LVL(gpio)));
417 }
418 }
419 return 0;
420}
421
422static int dbg_gpio_open(struct inode *inode, struct file *file)
423{
424 return single_open(file, dbg_gpio_show, &inode->i_private);
425}
426
427static const struct file_operations debug_fops = {
428 .open = dbg_gpio_open,
429 .read = seq_read,
430 .llseek = seq_lseek,
431 .release = single_release,
432};
433
434static int __init tegra_gpio_debuginit(void)
435{
436 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
437 NULL, NULL, &debug_fops);
438 return 0;
439}
440late_initcall(tegra_gpio_debuginit);
441#endif